Come identificare Agone

Per identificare Agone (Alosa agone), osserva queste caratteristiche chiave.

Caratteristiche fisiche

Forma del corpo

compressed

Colorazione

Silvery flanks, darker bluish-green to greyish-brown dorsum, white belly. Often possesses a series of 1-10 (typically 4-8) dark spots along the lateral line, which can be faint or prominent. The first spot is usually the most distinct.

Tipo di squame

cycloid

Posizione della bocca

terminal

Caratteristiche distintive

Deep, compressed body, Large, deciduous scales, Terminal mouth, Absence of a lateral line on the body (sensory pores are present on the head), Presence of a distinct notch in the upper jaw, Typically 1-10 dark spots along the flank, posterior to the operculum

Pinna dorsale

Single, short-based dorsal fin, located mid-body. Typically 15-19 soft rays.

Pinna caudale

Deeply forked caudal fin.

Pinna pettorale

Relatively small, positioned low on the body. Typically 13-16 soft rays.

Pinne distintive

Pelvic fins are small and located abdominally. Anal fin is relatively long, with 19-23 soft rays.

Consigli per l'identificazione

1. 1

   Body Shape and Coloration

   Look for a deep, compressed, silvery body with a darker back and white belly. The presence of dark spots along the flank is a key indicator, though their number and intensity can vary.

2. 2

   Mouth and Jaw

   Observe the terminal mouth and the distinct notch in the upper jaw, which is characteristic of Alosa species.

3. 3

   Scale Size

   Note the relatively large, easily detached (deciduous) scales.

4. 4

   Fin Ray Counts

   For precise identification, fin ray counts (e.g., dorsal 15-19, anal 19-23) can be used, especially when distinguishing from other Alosa species.

5. 5

   Geographic Location

   Its presence in the large lakes of Northern Italy and Southern Switzerland is a strong indicator, as its range is restricted.

Esplora Agone